Find area of parallelogram ABEF is 84 square meters.

a)Find the area of the triangle BDE

b)Find the area of trapezoid CDEF


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84m square
which class r u?
I mean to ask that is the area of parallelogram ABEF 84 square meters, if not then what is the number hinting at?
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Answers

2016-02-21T20:09:43+05:30
As this is a regular trapezium
all sides of the triangle are equal I.e 20 cm
height can be figured out by pythagoras theorem
hypotenuse square = side square + side square
20^2 = 10^2 + x^2
400 = 100 + x^2
400 - 100 = x^2
300 = x^2
x = /300
x = 17.32 cm

area = 1/2bh
1/2 × 10 × 17.32
5 × 17.32
86.5 cm^2
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